5 Ways to Fix an iPhone That Keeps Shutting Down

Get your iPhone working again

What to Know

  • An iPhone that keeps turning off can be caused by faulty apps, water damage, or (usually) battery issues.
  • Sometimes, a hard reset will fix an iPhone that keeps turning off, or power cycling, on its own.
  • If all else fails, you may need to contact Apple Support for a battery replacement to stop the issue from recurring.

Whether we need them to communicate, entertain us, or just make sure we wake up on time each morning, we rely on our iPhones to work correctly all the time. So an iPhone that keeps shutting off for no obvious reason is a problem.

What Causes an iPhone to Keep Shutting Down

There are a number of things that could cause this problem, including faulty apps and water damage, but, in the vast majority of the cases, the problem is the battery. There are a few ways to tell for sure that the battery is the problem: the Battery Health feature built into the iOS, if your iPhone shuts down at 30% battery, and a tool provided by Apple.

How to Fix an iPhone That Keeps Shutting Down

Before you go down the battery-replacement route, there are some easy software steps you can take to try to fix an iPhone that keeps shutting off.

  1. Hard reset your iPhone. When you're having problems like your iPhone randomly shutting off, the first and easiest step to fixing it is usually restarting the phone. In this case, though, you need to use a special kind of restart, called a hard reset. A hard reset is different from a standard restart because it more deeply resets the operating system and memory on the phone (but don't worry: you won't lose any data). If the cause of the restarts is an app with a flaw that causes it to drain the battery faster than it should, this can clear the problem.

  2. Update iOS. In some cases of the iPhone randomly shutting off, the problem is in the operating system. If the hard reset didn't work and you're running a version of the iOS earlier than 11.2, you should update to the latest version of the operating system. There are two ways to do this:

    If your iPhone can't update its OS, tap Settings > Notifications, then tap each app that's listed and toggle its Allow Notifications slider to off/white. Afterward, update the operating system, then, when the update is complete and the phone has restarted, turn notifications back on for each app whose notifications you turned off.

  3. Check your battery health. Battery Health provides two key pieces of information: the maximum charging capacity of your battery and how your battery's strength is affecting your phone's performance. The Battery Health section will also tell you if your battery is at a point where it needs to be replaced.

    To view your phone's Battery Health, tap Settings > Battery > Battery Health. If your Maximum Capacity is very low, that may be a sign of a problem with the battery. If you see anything other than "Peak Performance Capability," that may be a sign your battery has issues.

  4. Restore iPhone from backup using DFU. If your iPhone is still shutting down unexpectedly, you're going to need to try a DFU restore of your iPhone. DFU, To do this, connect your iPhone to the computer via USB, then, in iTunes, make a back up of your iPhone. With that done, put your iPhone into DFU Mode, then restore your iPhone from the back up you made.

  5. Contact Apple for a battery replacement. If none of the other things you've tried so far have solved the problem, that may be because the problem is with your iPhone's hardware, not software. It could be that the battery in your iPhone is defective or at the end of its life.

    Apple is your best bet for getting help, so contact the company to get tech support.

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